'Hazard Ranking System' can also refer to...

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(HRS)

A method used in the USA by the Environmental Protection Agency for evaluating potential relative risks to public health and the environment from abandoned or uncontrolled hazardous waste sites. The scale runs from 0 to 100; if a site scores 28.5 or more it is placed on the National Priorities List. See also National Oil and Hazardous Substances Contingency Plan, Site Inspection.